Needle and cast-off fob book sewing machines



(No Model.)

C. H. O TIS.

NEEDLE AND GAST-OPF PON BooK SEWING MACHINES.

No. 435,609. Patented sept. 2, 1890.

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S14/vanto?, ogm@ d @ad @2113 www OCM//W @y @mi-knew@ M45@ j E UNITED STATES PATENT OFFICE.

CHARLES H. OTIS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO TUE SMYTII MANUFACTURING COMPANY, OF SAME PLACE.

NEEDLE AND CAST-OFF FOR BOOK-SEWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 435,609, dated September 2, 1890.

` Application led April 7, 1890. Serial No. 346.875. (No model.)

To au whom it may concern: hook-pointed needle with a cast'off having a Be it known thatl, CHARLES 1l. OTIS,aciti wedge-shaped end to close the hook of the zen of the United States, residing at Hartford, needle. in the county of Hartford and State of Con- The sheet-holding bar or arm A is adapted 55 5 necticut, have invented an Improvement in to receive over its edge the folded sheet or Needles for Book-Sewing Machines, of which signature, and it is to be carried up to the the following` is a specification. place where the sewing is performed by any The present needle is intended for use in well-known means, such as those represented book-sewing machines in which the needle is in Letters Patent No. 220,312, granted October 6o xo provided with a penetrating-point to be forced 7, 1879, to D. M. Smyth, or those represented outwardly through the fold of the signature, in the Patent No. 184,961, granted December and with a hook into which a thread is laid 5, 1876, to G. XV. Glazier, and the sewingand drawn by the hook down into the signa needles made use of in connection with my ture for the reception of threads or loops improved hook-pointed needles may be of the x 5 passing longitudinally within such signature. character represented in either of these pat.-

In machines of this character the penetratents. ing-hook receives a movement at right angles The needle-plate B is secured upon the sheetto the bar upon which the signature or folded holding arm or bar, and it is grooved for the sheet is laid, and after the loop of thread has recept-ion of the needles and perforators, and 7o zo been drawn down into the sig-nature by the the perforators 2 are to penetrate the signahook such loop of thread has to be cast oit ture for the passage of the oni-ved needle 3, from the hook,in order that the loop of thread and the hook-pointed needles H are within may not be retained by the hook and broken the needle-plate and are used to perform the by the downward movement of the sheet-holdduties before mentioned. lt is, however, pref- 75 25 ing bar and the needles carried by it. erable to place the Shanks of these hook- In some classes of sewing-machines heretopointed needles in grooves or recesses in the fore constructed a hook-closer or east-off has needle-plate, and to give motion to these hookbeen made use of, and the same receives a pointed needles and to the perforators 2 by motion at the proper time to open or close the the needle-bar C, to which a motion is given 8o 3o hook of the needle. at the proper time to slide the needles and In my present improvement the cast-off is the perforators vertically and within the neemade to operate automatically by a frictional dle-plate D. detaining device, as hereinafter described, Upon the needle-har C is a rib l, entering and the hook-pointed needle within the sheeta transverse channel 5 in the shank of the 85 3 5 holding bar receives lthe proper movement, needlehar or the shank of thecast-oll to give and the cast-off is automatic in its operation motion to the same; but this needle-bar, to throw off the loop from the hook of the needle-plate, and the devices for giving moneedle. tion to the respective parts are not my invenln the drawings, Figure lis a cross-section tion. 90 4o of the sheet-holding bar and of the needle t' represents the cast-oit shank, and this plate at the line x a: of Fig. 2. Fig. 2 represhank is adjacent to the shank h of thehooksents the needleplate and the needles thereof pointed needle within the same groove of the detached from the sheet-holding bar. Fig. 3 needle-plate, and both the cast-oil shank and represents in larger size one of the needles needle-shank can be moved together verti- 9 5 45 and its cast-off. Fig. 4 shows the cast-off by cally and within the groove of thenecdle-plate,

a side and edge view. Fig. 5 shows the hookand there is a limited amount of play or difpointed needle by a side and edge view. Fig. ference of motion in the respective parts, and

6 is an elevation of ahook-pointed needle and the extent of this motion is indicated in Fig.

its east-off with the latter outside of the hook 3, where the pin 6 is within a notch. roo 5o of the needle. Fig. 7 is a section at the line Referring to Figs. l and 2, it will be appar- Q/ y of Fig. 6; and Fig. 8 is an elevation of a ent that the rib. of the needle-barC, passing into the transverse channel 5 of the hookpointed needle H, gives a vertical motion directly to such hook-pointed needle, and that the cast-off shank will not be moved until the shank h at the end of the notch` comes in contact with the pin 6. The cast-off shank is held b y friction within the needle-plate until the pin 6 is moved, and this friction is augmented by the cast-off shank being made slightly thicker than the needle-shank, so that it has more pressure and friction within the needle-plate than the shank of the hookpointed needle, and in addition to this a spring 7 is made use of on the cast-off shank to increase the friction thereof, in order that the "cast-off shank may not be moved until it is moved positively by the contact of the needleshank h with the pin (S, and the cast-olf 8 at the upper end of the cast-off shank i is to be of the form adapted to the particular form of the hook-pointed needle.

In Figs. 2, 3, 5, and S the hook-pointed needle H is represented as channeled longitudinally along the edge of the needle and into the hook-point, and into this channel is introduced a thin web or strip extending from the cast-off shank t' to the inclined point or cast-off 8, and when the cast-off is up Within the hook, as in Fig. 2, the point of such hook is adapted to seize the loop of thread and draw it down into the signature, holding the saine in the proper position for the needle 3 to carry its thread through the loop that is around thehook H, and the movements which are to be given to the needle-bar C and the sheet-holding bar are the same as before employed-*that is to say, the sheet-holding bar is is raised up,

n carrying` with it the folded sheet orsignature that is laid over it, and then the hook-pointed needles and perforators are projected and pass through the signature, and in doing vthis the shank of the cast-off will be carried upwardly with the shank of the hook-pointed needle and the cast-olf S will be below the point of the hook, as in Fig. 3. The thread that is laid below the point of the hook will, however, be taken by the hook and drawn down through the signature, because the cast-off shank will li rst remain stationary as the needleshank is drawn down, and hencel the cast-off will be received into the point of the needlehook, and then the two will bemoved together downwardly as the loop is drawn into the signature, and in this position the needle-bar C receives its extreme downward movement to pull the loop fully within the signature, ready for the needle 3, with its thread, to pass through the said loop, and as soon as this takes place the needle-bar C is slightly raised, and in consequence of the cast-off shankt' being held by friction the loop is effectually cast off from the hook of the pointed needle, because the cast-off 8 is below the hook and the inclined surface of the cast-off prevents the loop of thread being held by the hook and the loop of thread is free to be drawn up or tightened in the sewing operation..

Then the cast-off is in the form represented in Fig. 6, the operation is the same as before described; but in this instance the cast-off S is outside of the hook, instead of being in a groove within the hook, and this cast-off presses the loop off from the hook as the hook receives the slight rising movement before mentioned, and in this Fig. 6 I have represented the penetrating-point as extending up above the cast-off, so that the penetratingpoint and cast-off are togetherand the hook that catches the loop is within the penetratingpoint, this being a merc transposition without changing the operation of the parts; l and in Fig. S I have represented the cast-'off 8 as made with a wedge-shaped end adapted to close the hook itself. This can be used in cases where the character of sewing is such that the loop will be cast olf reliably from the hook, and the cast-off will simply close the hook to prevent the loop being caught after it has been cast off, and this cast-off also prevents the hook catching in the paper as such hook is drawn down into the signature.

I claim as my invention- I. The combination, in a.booksewing machine, with the sheet-holding bar or arm, of a grooved 1'1eedle-'plate, a hook-pointed needle having a shank supported by and sliding in the grooved needle-plate, a cast-off having a shank sliding within the grooved needleplate, means for applying friction to such shank for holding the cast-olf, and mechanism for moving the hook, su bstantially as set forth.

2. The hook-poin ted needle H and its shank lz', and the grooved needle-plate, within which the shank is supported, in combination with the cast-olf and its shank adjacent to the cast-olf shank, and mechanism for moving the hook-point-ed-needle shank and needle, substantially as set forth.

Signed by me this 18th day of March, 1890.

CHARLES H. O'lIS. Witnesses:

XV. B. MCCRAY, CHAs. E. PARKER.

shank h as rino for a )Til Ying friction to theV z z: l 

